Solving Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the two ratios and set the products equal to each other.

Front

If 5 ice cream cones are sold for every 3 brownies, what is the ratio of ice cream cones to brownies?

Back

The ratio of ice cream cones to brownies is 5:3.

Front

If there are 24 brownies sold, how many ice cream cones are sold?

Back

40 ice cream cones are sold.

Front

What is the unit rate?

Back

The unit rate is a comparison of two different quantities when they are combined together, expressed as a quantity of one.

Front

If Jeff ran 6 miles in 4 hours, what is his rate in miles per hour?

Back

His rate is 1.5 miles per hour.

Front

How many miles will Jeff run in 6 hours at the same rate?

Back

Jeff will run 9 miles.

Front

What does it mean for two ratios to be proportional?

Back

Two ratios are proportional if they are equal to each other.

Front

In a recipe, if 1.5 cups of milk is to 3 cups of flour, what is the ratio of milk to flour?

Back

The ratio of milk to flour is 1:2.

Front

If Seth used 5 cups of flour, how many cups of milk should he use to keep the proportions correct?

Back

Seth should use 2.5 cups of milk.